—Will Mr Brown come to visit the company ?—

—Will Mr Brown come to visit the company ?—We don’t know if he _______．If he ______，we’ll tell you．A.comes，comesB.will come，comesC.comes，will comeD.will come，will come

B解析前文if是是否的意思,后文是如果的意思,引导条件状语从句.根据题意前面叙述的是将来的事情,用将来时态,后文主句是将来时态,从句用一般现在时态,故选D.

谢谢了